Anna Kendrick claims Katy Perry touched her cleavage at the Grammy Awards.

The 28-year-old actress has revealed the 'Unconditional' hitmaker got a bit touchy-feeling at the award ceremony in Los Angeles last week by slotting her fingers in between her breasts.

Speaking on the television talk show 'Conan', she said: ''Katy Perry finger-banged my cleavage. It was a weird night . . . She's very mature!''

However, the 'Pitch Perfect' star admits she was rather chuffed by Katy's brave move because her risqué chest-baring Azzaro frock was crying out for attention.

She explained: ''I was kind of asking for it. If nobody had done it I would've been a little sad.''

Meanwhile, Anna couldn't believe her luck when she came face-to-face with her idol Beyoncé at the event.

She explained: ''I know everybody is, but I'm totally obsessed with Beyoncé. I walked past Beyoncé at one point, and because I'm not worthy I didn't look at her.

''[My friends and I] did make a detour down the front just to walk past Beyoncé . . . We thought, 'We'll just walk past her and get some of her aura.' We walked past and my friend was like, 'Dude, she was motioning to you and you just walked past her!'

''And I panicked. I mean, I didn't know quite what to do, but I thought, 'Once in a lifetime, just do it.' I went back and I was like, 'I'm so sorry to do this, I just wanted to meet you. You're such an inspiration.'

''And she stood up -- she was so nice -- and she points to Jay Z and was like, 'Oh, we just watched you on the Kennedy Center Honors. You were so great. You were so cute in your little red dress.'''